Old Germans can be upset by gossip! (13)
I believe the answer is:
scandalmonger
'gossip' is the definition.
(I know that scandalmonger is a type of gossip)
'old germans can be upset by' is the wordplay.
'be upset by' indicates an anagram.
'old'+'germans'+'can'='oldgermanscan'
'oldgermanscan' with letters rearranged gives 'SCANDALMONGER'.
(Other definitions for scandalmonger that I've seen before include "Rumour spreader" , "Muck-spreader" , "Spreader of malicious gossip" , "Person spreading malicious tittle-tattle" , "Muckraker" .)